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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4182841a1f56c851a5ce9ec5644bbf9b485969e126747d8df75c3d0ab5a8c13b' 
  AND token = 'cmN3mvi3HvawWXhxg+u458qDlaKHmxoKdza2dXUm5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}